Suggestion: Advanced Vision Puzzles

I know this might be difficult with the engine and "null" moves, but it'd be neat to have more "unconventional" puzzles, like when only one side gets to move and take all pieces on each move or moving a knight to all squares that are not attacked or knights tours or having puzzles like seeing how many legal moves there are for one side and how many are checks or checkmates or stuff like switching two pieces to make the position legal and fulfill certain criteria.

ok

I agree, the current vision puzzles are only helpful for beginners.  I've found the kinds of puzzles @Chessbovine mentioned to be very useful for vision training.

Interesting. We'll have to look into it. 

make first win of the day count double points 

Another one could be seeing a position and then using the editor to reconstruct it with increasing amount of pieces

You could have a Knight Jump where you try to find all the shortest ways to get to a particular square.